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Home >> Hyundai >> 2014 >> Veloster Base, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) - Non-Turbo >> DTC P2128: Throttle Pedal Position Sensor Switch 'E' Circuit High Input >> Component Inspection
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Component Inspection

  1. IG "OFF" and install a GDS.
  2. Connect probe to APS1 and APS2 to check signal waveform by using oscilloscope function.
  3. Measure signal waveform of APS by pressing and depressing accelerator pedal.

    Specification:  Signal waveform will be displayed as follows.

    Fig 1: Checking APS Signal Waveform
    G08814033Courtesy of HYUNDAI MOTOR AMERICA
  4. Is the measured signal waveform O.K?

    YES 

    Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    Substitute with a known-good APS and check for proper operation. If the problem is corrected, replace APS and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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